Hi Chris...you can use blasadmin utility to change the storage Directory.
open the NSH and do blasamin
blasadmin set fileserver location "/tmp/Storage"
( you can put the path of partition here and run the utility , wdout quotes).
Also look at the documentation available here https://docs.bmc.com/docs/display/public/bsa82/Changing+the+location+of+the+file+server
Make sure you stop Application Server before changing the location.
Thank's very much for the helpful answers!